CN104950207B - The method for detecting short circuit and device of a kind of photovoltaic DC-to-AC converter - Google Patents
The method for detecting short circuit and device of a kind of photovoltaic DC-to-AC converter Download PDFInfo
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Abstract
The present invention relates to a kind of method for detecting short circuit of photovoltaic DC-to-AC converter and device.This method includes：S1, detection photovoltaic inverter direct-flow side voltage-to-ground；S2, based on the DC side voltage-to-ground obtain DC side power frequency common-mode voltage；S3, the grid side phase voltage based on the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter judge whether the AC of the photovoltaic DC-to-AC converter is short-circuit.Implement the method for detecting short circuit and device of the photovoltaic DC-to-AC converter of the present invention, only only need to detect photovoltaic inverter direct-flow side voltage-to-ground, it is possible to judge whether AC is short-circuit, therefore detection circuit is simple, cost is relatively low.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter field, more specifically to a kind of method for detecting short circuit of photovoltaic DC-to-AC converter
And device.
Background technology
For the special photovoltaic DC-to-AC converter of parallel network power generation, if related Grid-connection standards require that the exchange of photovoltaic DC-to-AC converter is defeated
Go out short circuit, photovoltaic DC-to-AC converter should be able to automatic protection.For the photovoltaic DC-to-AC converter with isolating transformer, transformer primary side and secondary
Short circuit is intended to carry out automatic protection.
At present, for the photovoltaic DC-to-AC converter with isolating transformer, AC short-circuit protection is mainly by detecting transformer
The live wire voltage-to-ground of primary and secondary side carries out short-circuit judgement and protected accordingly.This method needs the original to transformer
Side, secondary carry out the sampling of live wire voltage-to-ground, it is necessary to set two sets of sampling apparatuses in primary and secondary side, therefore design cumbersome respectively
And cost is higher.
The content of the invention
The technical problem to be solved in the present invention is, for prior art the need for set two sets to sample in primary and secondary side
Device, therefore there is provided a kind of short circuit of photovoltaic DC-to-AC converter simple in construction, with low cost for the cumbersome and higher cost defect of design
Detection method and device.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of short-circuit detecting side of photovoltaic DC-to-AC converter
Method, including：
S1, detection photovoltaic inverter direct-flow side voltage-to-ground；
S2, based on the DC side voltage-to-ground obtain DC side power frequency common-mode voltage；
S3, the grid side phase voltage based on the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter judge the light
Whether the AC for lying prostrate inverter is short-circuit.
In the method for detecting short circuit of photovoltaic DC-to-AC converter of the present invention, the step S2 further comprises：
S21, the DC quantity for extracting using periodical filtering mode the DC side voltage-to-ground；
S22, subtract using the instantaneous value of the DC side voltage-to-ground DC quantity to obtain the DC side work
Frequency common-mode voltage.
In the method for detecting short circuit of photovoltaic DC-to-AC converter of the present invention, the step S3 further comprises：
S31, obtain the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter grid side phase voltage difference it is exhausted
To value；
S32, when the absolute value be less than predetermined threshold when judge the photovoltaic DC-to-AC converter AC short circuit.
In the method for detecting short circuit of photovoltaic DC-to-AC converter of the present invention, the predetermined threshold is the photovoltaic DC-to-AC converter
Grid side phase voltage 10%-30%.
In the method for detecting short circuit of photovoltaic DC-to-AC converter of the present invention, further comprise:
S4, when the AC for judging the photovoltaic DC-to-AC converter in step s3 is short-circuit, output exchange output short-circuit mark
Alert and close described photovoltaic DC-to-AC converter.
Another technical scheme that the present invention solves the use of its technical problem is to construct a kind of short-circuit detecting of photovoltaic DC-to-AC converter
Device, including：
Detection module, for detecting photovoltaic inverter direct-flow side voltage-to-ground；
Computing module, for obtaining DC side power frequency common-mode voltage based on the DC side voltage-to-ground；
Determination module, for the grid side phase voltage based on the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter
Judge whether the AC of the photovoltaic DC-to-AC converter is short-circuit.
In the short-circuit detecting device of photovoltaic DC-to-AC converter of the present invention, the computing module further comprises：
DC quantity extraction unit, the DC quantity for extracting the DC side voltage-to-ground using periodical filtering mode；
Subtrator, subtracts the DC quantity described so as to obtain for the instantaneous value using the DC side voltage-to-ground
DC side power frequency common-mode voltage.
In the short-circuit detecting device of photovoltaic DC-to-AC converter of the present invention, the determination module further comprises：
Absolute value acquiring unit, the grid side for obtaining the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter
The absolute value of the difference of phase voltage；
Short-circuit identifying unit, the AC for judging the photovoltaic DC-to-AC converter when the absolute value is less than predetermined threshold
Short circuit.
In the short-circuit detecting device of photovoltaic DC-to-AC converter of the present invention, the predetermined threshold is the photovoltaic DC-to-AC converter
Grid side phase voltage 10%-30%.
In the short-circuit detecting device of photovoltaic DC-to-AC converter of the present invention, further comprise:
Short circuit protection module, for when the AC for judging the photovoltaic DC-to-AC converter is short-circuit, output to exchange output short-circuit
Mark alerts and closes described photovoltaic DC-to-AC converter.
Implement the method for detecting short circuit and device of the photovoltaic DC-to-AC converter of the present invention, only only need to detection photovoltaic DC-to-AC converter straight
Flow side voltage-to-ground, it is possible to judge whether AC is short-circuit, therefore detection circuit is simple, cost is relatively low.Further, due to
Detection is photovoltaic DC-to-AC converter DC side voltage-to-ground rather than isolating transformer primary and secondary side live wire voltage-to-ground, therefore is applicable
In the photovoltaic DC-to-AC converter with or without isolating transformer.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the flow chart of the method for detecting short circuit of photovoltaic DC-to-AC converter according to a first embodiment of the present invention；
Fig. 2 is the flow chart of the method for detecting short circuit of photovoltaic DC-to-AC converter according to a second embodiment of the present invention；
Fig. 3 is the photovoltaic inversion for the method for detecting short circuit for using the photovoltaic DC-to-AC converter according to the embodiment of the present invention first and two
The circuit theory diagrams of device；
Fig. 4 is the theory diagram of the short-circuit detecting device of photovoltaic DC-to-AC converter according to a first embodiment of the present invention；
Fig. 5 is the theory diagram of the short-circuit detecting device of photovoltaic DC-to-AC converter according to a second embodiment of the present invention.
Embodiment
Fig. 1 is the flow chart of the method for detecting short circuit of photovoltaic DC-to-AC converter according to a first embodiment of the present invention.Such as Fig. 1 institutes
Show, in step sl, detect photovoltaic inverter direct-flow side voltage-to-ground.Those skilled in the art know, can use routine
Voltage check device or circuit Direct-detection Optical lie prostrate the DC side voltage-to-ground of inverter.In step s 2, based on detecting
The DC side voltage-to-ground of photovoltaic DC-to-AC converter obtains DC side power frequency common-mode voltage.For example, being carried by using periodical filtering mode
The DC quantity of the DC side voltage-to-ground is taken, the DC quantity is then subtracted using the instantaneous value of the DC side voltage-to-ground
So as to obtain the DC side power frequency common-mode voltage.Those skilled in the art know, in other embodiments of the invention, may be used also
To use other modes or device, the DC side power frequency common-mode voltage is directly extracted.In step s3, based on the direct current
The grid side phase voltage of side power frequency common-mode voltage and the photovoltaic DC-to-AC converter judges whether the AC of the photovoltaic DC-to-AC converter is short
Road.In one embodiment of the invention, when the grid side phase of the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter
When difference in voltage is more than predetermined threshold, that is, judge whether the AC of the photovoltaic DC-to-AC converter is short-circuit.In another reality of the present invention
Apply in example, the difference of the grid side phase voltage of the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter can be obtained first
Absolute value；Then the absolute value and predetermined threshold are compared, the light is judged when the absolute value is less than predetermined threshold
Lie prostrate the AC short circuit of inverter.In one embodiment of the invention, the predetermined threshold is the electricity of the photovoltaic DC-to-AC converter
The 10%-30% of net side phase voltage.In a preferred embodiment of the invention, the predetermined threshold is the photovoltaic DC-to-AC converter
The 20% of grid side phase voltage.Those skilled in the art can be mutually electric using any of voltage detecting circuit detection grid side
Pressure, or those skilled in the art can use experience grid side phase voltage.Those skilled in the art can also rule of thumb select
Other magnitudes of voltage are selected as predetermined threshold.
Implement the method for detecting short circuit of the photovoltaic DC-to-AC converter of the present invention, only only need to detect photovoltaic inverter direct-flow side pair
Ground voltage, it is possible to judge whether AC is short-circuit, therefore detection circuit is simple, cost is relatively low.Further, due to detection
It is photovoltaic DC-to-AC converter DC side voltage-to-ground rather than isolating transformer primary and secondary side live wire voltage-to-ground, therefore suitable for carrying
Or without the photovoltaic DC-to-AC converter of isolating transformer.
Fig. 2 is the flow chart of the method for detecting short circuit of photovoltaic DC-to-AC converter according to a second embodiment of the present invention.In step S1
In, detect photovoltaic inverter direct-flow side voltage-to-ground.Those skilled in the art know, can use conventional voltage check device
Or circuit Direct-detection Optical lies prostrate the DC side voltage-to-ground of inverter.In step s 2, extract described using periodical filtering mode
The DC quantity of DC side voltage-to-ground.In other embodiments of the invention, can also be using other methods, such as filter in real time
The modes such as ripple extract the DC quantity of the DC side voltage-to-ground.In step s3, using the wink of the DC side voltage-to-ground
Duration subtracts the DC quantity to obtain the DC side power frequency common-mode voltage.In step s 4, the DC side work is obtained
The absolute value of the difference of the grid side phase voltage of frequency common-mode voltage and the photovoltaic DC-to-AC converter.In step s 5, judge described absolute
Whether value is more than predetermined threshold, if performing step S6, otherwise the method for detecting short circuit terminates.In the implementation of the present invention
In example, the predetermined threshold is the 10%-30% of the grid side phase voltage of the photovoltaic DC-to-AC converter.One in the present invention is preferred real
Apply in example, the predetermined threshold is the 20% of the grid side phase voltage of the photovoltaic DC-to-AC converter.Those skilled in the art can use
Any of voltage detecting circuit detects that grid side phase voltage, or those skilled in the art can use experience grid side phase
Voltage.Those skilled in the art can also rule of thumb select other magnitudes of voltage as predetermined threshold.In step s 6, institute is judged
The AC short circuit of photovoltaic DC-to-AC converter is stated, output exchange output short-circuit mark alerts and closes described photovoltaic DC-to-AC converter.
The principle of the method for detecting short circuit of the photovoltaic DC-to-AC converter shown in Fig. 1 and 2 is described as follows with reference to Fig. 3.Such as Fig. 3
It is shown, when exchange is without occurring short circuit, photovoltaic DC-to-AC converter DC side power frequency common-mode voltage UCMPV-And UCMPV+With photovoltaic DC-to-AC converter
There is following relation in three-phase voltage Ua, Ub and Uc of AC：
UCMPV-Two UCMPV+Two (UaOne UbOne Uc)=OV
(UaOne UbOne Uc)=OV
UaOne Uc21 Ub
And when short circuit occurs for exchange, i.e. after Ub ground connection, photovoltaic DC-to-AC converter DC side power frequency common-mode voltage UCMPV-With
UCMPV+There is following relation with three-phase voltage Ua, Ub and Uc of photovoltaic DC-to-AC converter AC：
UCMPV-=UCMPV+=Ua+Uc=-Ub
It follows that when short circuit occurs for the AC of photovoltaic DC-to-AC converter circuit, being reacted to the straight of photovoltaic DC-to-AC converter circuit
It will add Ub on the basis of original DC side power frequency common-mode voltage to flow side.Therefore, when detection DC side power frequency common mode
Ub is increased about on the basis of voltage, i.e., on the basis of error is considered, DC side power frequency common-mode voltage and the photovoltaic are inverse
When the absolute value for becoming the difference of the grid side phase voltage of device is less than predetermined threshold, that is, think that the AC of photovoltaic DC-to-AC converter circuit occurs
Short circuit.
Therefore, implement the method for detecting short circuit of the photovoltaic DC-to-AC converter of the present invention, only only need to detection photovoltaic DC-to-AC converter straight
Flow side voltage-to-ground, it is possible to judge whether AC is short-circuit, therefore detection circuit is simple, cost is relatively low.Further, due to
Detection is photovoltaic DC-to-AC converter DC side voltage-to-ground rather than isolating transformer primary and secondary side live wire voltage-to-ground, therefore is applicable
In the photovoltaic DC-to-AC converter with or without isolating transformer.
Fig. 4 is the theory diagram of the short-circuit detecting device of photovoltaic DC-to-AC converter according to a first embodiment of the present invention.Such as Fig. 4 institutes
Show, the short-circuit detecting device of photovoltaic DC-to-AC converter of the invention includes detection module 100, computing module 200 and determination module 300.
Wherein, the detection module 100 is used to detect photovoltaic inverter direct-flow side voltage-to-ground.Those skilled in the art know, described
Detection module 100 can be conventional voltage check device or circuit.The computing module 200 is used to be based on the DC side pair
Ground voltage obtains DC side power frequency common-mode voltage.The computing module 200 can extract described by using periodical filtering mode
The DC quantity of DC side voltage-to-ground, then subtracts the DC quantity to obtain using the instantaneous value of the DC side voltage-to-ground
Obtain the DC side power frequency common-mode voltage.Those skilled in the art know, in other embodiments of the invention, can also use
Other modes or device, directly extract the DC side power frequency common-mode voltage.The determination module 300 is used for based on described straight
Whether the AC of the grid side phase voltage judgement photovoltaic DC-to-AC converter of stream side power frequency common-mode voltage and the photovoltaic DC-to-AC converter
Short circuit.In one embodiment of the invention, the predetermined threshold is the 10%- of the grid side phase voltage of the photovoltaic DC-to-AC converter
30%.In a preferred embodiment of the invention, the predetermined threshold is the grid side phase voltage of the photovoltaic DC-to-AC converter
20%.Those skilled in the art can detect grid side phase voltage, or this area skill using any of voltage detecting circuit
Art personnel can use experience grid side phase voltage.Those skilled in the art can also rule of thumb select other magnitude of voltage conducts
Predetermined threshold.
Those skilled in the art know that detection module 100, computing module 200 and determination module 300 can be according to Fig. 1-2
In each embodiment of the method for detecting short circuit of photovoltaic DC-to-AC converter for showing build, the description that its principle can also be in reference picture 3.
Those skilled in the art are based on the teachings of the present invention, can realize above-mentioned detection module 100, computing module 200 and determination module
300 structure, is just not repeated herein.
Implement the short-circuit detecting device of the photovoltaic DC-to-AC converter of the present invention, only only need to detect photovoltaic inverter direct-flow side pair
Ground voltage, it is possible to judge whether AC is short-circuit, therefore detection circuit is simple, cost is relatively low.Further, due to detection
It is photovoltaic DC-to-AC converter DC side voltage-to-ground rather than isolating transformer primary and secondary side live wire voltage-to-ground, therefore suitable for carrying
Or without the photovoltaic DC-to-AC converter of isolating transformer.
Fig. 5 is the theory diagram of the short-circuit detecting device of photovoltaic DC-to-AC converter according to a second embodiment of the present invention.Such as Fig. 5 institutes
Show, the short-circuit detecting device of photovoltaic DC-to-AC converter of the invention includes detection module 100, computing module 200, the and of determination module 300
Short circuit protection module 400.Wherein computing module 200 includes DC quantity extraction unit 210 and subtrator 220.Determination module 300
Including absolute value acquiring unit 310 and short-circuit identifying unit 320.The detection module 100 is used to detect photovoltaic DC-to-AC converter direct current
Side voltage-to-ground.The DC quantity extraction unit 210 is used to extract the DC side voltage-to-ground using periodical filtering mode
DC quantity.The subtrator 220 is used to subtract the DC quantity to obtain using the instantaneous value of the DC side voltage-to-ground
Obtain the DC side power frequency common-mode voltage.The absolute value acquiring unit 310 is used to obtain the DC side power frequency common-mode voltage
With the absolute value of the difference of the grid side phase voltage of the photovoltaic DC-to-AC converter.The short-circuit identifying unit 320 is used for when described absolute
Value judges the AC short circuit of the photovoltaic DC-to-AC converter when being less than predetermined threshold.In one embodiment of the invention, it is described pre-
Determine the 10%-30% for the grid side phase voltage that threshold value is the photovoltaic DC-to-AC converter.In a preferred embodiment of the invention, it is described
Predetermined threshold is the 20% of the grid side phase voltage of the photovoltaic DC-to-AC converter.Those skilled in the art can use any of
Voltage detecting circuit detects that grid side phase voltage, or those skilled in the art can use experience grid side phase voltage.Ability
Field technique personnel can also rule of thumb select other magnitudes of voltage as predetermined threshold.The short circuit protection module 400 is used for
When judging that the AC of the photovoltaic DC-to-AC converter is short-circuit, output exchange output short-circuit mark alerts and closes described photovoltaic inversion
Device.
Those skilled in the art know that detection module 100, DC quantity extraction unit 210, subtrator 220, absolute value are obtained
Take unit 310, short-circuit identifying unit 320 and short circuit protection module 400 can be according to the short of the photovoltaic DC-to-AC converter shown in Fig. 1-2
Each embodiment of road detection method is built, the description that its principle can also be in reference picture 3.Those skilled in the art are based on this hair
Bright teaching, can realize the structure of above-mentioned detection module 100, computing module 200 and determination module 300, just no longer tire out herein
State.
Implement the method for detecting short circuit and device of the photovoltaic DC-to-AC converter of the present invention, only only need to detection photovoltaic DC-to-AC converter straight
Flow side voltage-to-ground, it is possible to judge whether AC is short-circuit, therefore detection circuit is simple, cost is relatively low.Further, due to
Detection is photovoltaic DC-to-AC converter DC side voltage-to-ground rather than isolating transformer primary and secondary side live wire voltage-to-ground, therefore is applicable
In the photovoltaic DC-to-AC converter with or without isolating transformer.
Although the present invention is illustrated by specific embodiment, it will be appreciated by those skilled in the art that, do not departing from
In the case of the scope of the invention, various conversion and equivalent substitute can also be carried out to the present invention.Therefore, the present invention is not limited to institute
Disclosed specific embodiment, and whole embodiments for falling within the scope of the appended claims should be included.
Claims (8)
1. a kind of method for detecting short circuit of photovoltaic DC-to-AC converter, it is characterised in that including：
S1, detection photovoltaic inverter direct-flow side voltage-to-ground；
S2, based on the DC side voltage-to-ground obtain DC side power frequency common-mode voltage；
S3, the grid side phase voltage based on the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter judge that the photovoltaic is inverse
Whether the AC for becoming device is short-circuit；
Wherein described step S3 further comprises：
The absolute value of the difference of S31, the acquisition DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter grid side phase voltage；
S32, when the absolute value be less than predetermined threshold when judge the photovoltaic DC-to-AC converter AC short circuit.
2. the method for detecting short circuit of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that the step S2 is further
Including：
S21, the DC quantity for extracting using periodical filtering mode the DC side voltage-to-ground；
S22, subtract using the instantaneous value of the DC side voltage-to-ground DC quantity and be total to so as to obtain the DC side power frequency
Mode voltage.
3. the method for detecting short circuit of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that the predetermined threshold is institute
State the 10%-30% of the grid side phase voltage of photovoltaic DC-to-AC converter.
4. the method for detecting short circuit of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that further comprise：
S4, when the AC for judging the photovoltaic DC-to-AC converter in step s3 is short-circuit, output exchange output short-circuit mark alarm
And close described photovoltaic DC-to-AC converter.
5. a kind of short-circuit detecting device of photovoltaic DC-to-AC converter, it is characterised in that including：
Detection module, for detecting photovoltaic inverter direct-flow side voltage-to-ground；
Computing module, for obtaining DC side power frequency common-mode voltage based on the DC side voltage-to-ground；
Determination module, judges for the grid side phase voltage based on the DC side power frequency common-mode voltage and the photovoltaic DC-to-AC converter
Whether the AC of the photovoltaic DC-to-AC converter is short-circuit；
Wherein described determination module further comprises：
Absolute value acquiring unit, it is mutually electric for obtaining the DC side power frequency common-mode voltage and the grid side of the photovoltaic DC-to-AC converter
The absolute value of the difference of pressure；
Short-circuit identifying unit, for judging that the AC of the photovoltaic DC-to-AC converter is short when the absolute value is less than predetermined threshold
Road.
6. the short-circuit detecting device of photovoltaic DC-to-AC converter according to claim 5, it is characterised in that the computing module enters one
Step includes：
DC quantity extraction unit, the DC quantity for extracting the DC side voltage-to-ground using periodical filtering mode；
Subtrator, subtracts the DC quantity to obtain the direct current for the instantaneous value using the DC side voltage-to-ground
Side power frequency common-mode voltage.
7. the short-circuit detecting device of photovoltaic DC-to-AC converter according to claim 5, it is characterised in that the predetermined threshold is institute
State the 10%-30% of the grid side phase voltage of photovoltaic DC-to-AC converter.
8. the short-circuit detecting device of photovoltaic DC-to-AC converter according to claim 5, it is characterised in that further comprise:
Short circuit protection module, for when the AC for judging the photovoltaic DC-to-AC converter is short-circuit, output exchange output short-circuit to be identified
Alert and close described photovoltaic DC-to-AC converter.
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| CN105548755B (en) * | 2015-12-11 | 2018-11-09 | 上能电气股份有限公司 | The method for detecting inverter AC and DC side ground connection by single ground insulation impedance detection network |
| CN105911408B (en) * | 2016-04-11 | 2018-12-04 | 浙江昱能科技有限公司 | Fault to ground detection circuit, inverter and its fault detection method suitable for inverter |
| CN111082460B (en) * | 2018-03-02 | 2022-04-08 | 阳光电源股份有限公司 | Photovoltaic power generation system, inverter, grid-connected operation control method and device thereof |
| CN110261713B (en) * | 2019-05-05 | 2021-07-02 | 南瑞集团有限公司 | Method for diagnosing AC side ground fault of converter of flexible DC power grid |
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| JP2001045652A (en) * | 1999-07-30 | 2001-02-16 | Matsushita Electric Works Ltd | Arc detector |
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| CN102163837A (en) * | 2011-03-09 | 2011-08-24 | 天津大学 | Method for protecting inverter in distributed generating system |
| CN202351399U (en) * | 2011-11-30 | 2012-07-25 | 常州佳讯光电产业发展有限公司 | Control device capable of simulating short circuit current of direct current breaker for photovoltaic inverter |
| CN202535041U (en) * | 2012-03-29 | 2012-11-14 | 昆兰新能源技术常州有限公司 | Short-circuit protecting circuit of high-power photovoltaic inverter |
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